What city is 37921 in?

37921 is a Knoxville, TN mailing address. By land area, 78% lies inside Knoxville; the rest is outside any Census-defined city or community.

What is the population of 37921?

About 28,717 people (±1,777), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 28,903.

What is the median household income in 37921?

$60,013 (±$5,863), compared with $69,595 for Tennessee as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 37921?

19 USPS carrier routes with 12,936 residential and 996 business mailboxes (13,934 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 37921?

The closest, measured center to center: 37912 (2.3 mi, Knoxville), 37909 (2.4 mi, Knoxville), 37916 (4.2 mi, Knoxville), 37919 (4.4 mi, Knoxville), 37902 (4.7 mi, Knoxville) and 37929 (4.9 mi, Knoxville).

37921 ZIP Code, Knoxville, TN

37921 is a ZIP code in Knoxville, Tennessee in Knox County. It covers 16 square miles of land. The closest ZIP codes are 37912, 37909 and 37916. 28,717 people live here in 11,634 households. At about 1,806 people per square mile it has suburban density, and owners and renters are mixed (60% own). Median household income is $60,013, below the Tennessee median of $69,595.

Quick facts

Mailing city: Knoxville, TN
County: Knox County
Land area: 16 sq mi
Population: 28,717
Median household income: $60,013
Carrier routes: 19 (12,936 homes)

Key figures

Measure	Value
Residents	28,717
Households	11,634
Median household income	$60,013
Income per person	$30,928
Median age	34.6
Homeowners	59.8%
Median home value	$226,300
Median rent	$1,233
Bachelor's degree or higher	26.3%
Average commute (minutes)	20
Households with kids under 18	30.2%
Moved in the past year	12.3%
Below the poverty line	17.2%
Broadband internet	85.2%
Speak a non-English language at home	11.7%

Household income

% of households	Value
<$10K	7.4%
$10–15K	3.8%
$15–25K	7.7%
$25–35K	8.5%
$35–50K	15.3%
$50–75K	18.6%
$75–100K	11.0%
$100–150K	19.8%
$150–200K	4.5%
$200K+	3.6%

Age

% of all residents	Value
<10	12.5%
10–19	13.5%
20–24	7.5%
25–34	17.3%
35–44	12.4%
45–54	13.2%
55–64	10.7%
65–74	8.2%
75+	4.7%

Tenure

% of housing units	Value
Owned, with mortgage	33.5%
Owned outright	20.7%
Rented	35.7%
Vacant	10.1%

Type of building

% of housing units	Value
Detached house	69.0%
Townhome	5.9%
2–4 units	6.4%
5–19 units	11.2%
20+ units	3.7%
Mobile / other	3.8%

Businesses in 37921

703 business establishments with 26,636 employees (ZIP Codes Business Patterns 2023).

Wholesale Trade: 100
Retail Trade: 94
Construction: 79
Manufacturing: 60
Other Services (except Public Administration): 55
Health Care and Social Assistance: 51
Transportation and Warehousing: 48
Administrative and Support and Waste Management and Remediation Services: 48

EDDM carrier routes

37921 has 19 USPS carrier routes with 12,936 residential and 996 business mailboxes. Open the EDDM route map.

Carrier routes in 37921

37921 has 19 USPS carrier routes (15 city (C), 4 rural (R)) with 12,936 residential and 996 business mailboxes. Routes range from 208 homes (R160) to 1,022 homes (C071); the median route has 736 homes. The Census counted 11,634 households in 37921 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	1
250–499	2
500–749	8
750–999	7
1,000–1,499	1
1,500+	0

Best routes in 37921 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C005 — USPS business mailboxes 235, 291 homes
Route C025 — USPS business mailboxes 126, 522 homes
Route C013 — USPS business mailboxes 113, 661 homes
Route C002 — USPS business mailboxes 90, 796 homes
Route C010 — USPS business mailboxes 67, 567 homes

Select these 5 routes on the route map

Every carrier route in 37921

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	731	40	$64,699	—	—	—
C002	City	796	90	$24,717	—	—	—
C005	City	291	235	$75,364	—	—	—
C006	City	738	6	$59,788	—	—	—
C008	City	736	52	$54,782	—	—	—
C010	City	567	67	$42,424	—	—	—
C013	City	661	113	$75,364	—	—	—
C019	City	657	22	$67,881	—	—	—
C025	City	522	126	$54,782	—	—	—
C029	City	813	5	$95,579	—	—	—
C053	City	842	16	$95,579	—	—	—
C066	City	763	1	$75,364	—	—	—
C071	City	1,022	41	$54,782	—	—	—
C074	City	387	64	$17,709	—	—	—
C085	City	788	11	$63,363	—	—	—
R056	Rural	733	36	$76,552	—	—	—
R080	Rural	898	19	$95,579	—	—	—
R122	Rural	783	3	$83,454	—	—	—
R160	Rural	208	49	$64,513	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 37921 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

37912 — Knoxville city, TN (2.3 mi)
37909 — Knoxville city, TN (2.4 mi)
37916 — Knoxville city, TN (4.2 mi)
37919 — Knoxville city, TN (4.4 mi)
37902 — Knoxville city, TN (4.7 mi)
37929 — Knoxville city, TN (4.9 mi)
37917 — Knoxville city, TN (5.2 mi)
37923 — Knoxville city, TN (5.6 mi)

Areas that include 37921

Where it ranks

Mail every home in 37921

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 37921, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 37921 in?: 37921 is a Knoxville, TN mailing address. By land area, 78% lies inside Knoxville; the rest is outside any Census-defined city or community.
What county is 37921 in?: 37921 is in Knox County.
What is the population of 37921?: About 28,717 people (±1,777), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 28,903.
What is the median household income in 37921?: $60,013 (±$5,863), compared with $69,595 for Tennessee as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 37921?: 19 USPS carrier routes with 12,936 residential and 996 business mailboxes (13,934 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 37921?: The closest, measured center to center: 37912 (2.3 mi, Knoxville), 37909 (2.4 mi, Knoxville), 37916 (4.2 mi, Knoxville), 37919 (4.4 mi, Knoxville), 37902 (4.7 mi, Knoxville) and 37929 (4.9 mi, Knoxville).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.